Structure for an air pump

ABSTRACT

An improvement in the structure for an air pump, and in particular, an air pump, which is sealed to isolate the noise of operation, and the motor body and the cylinder, can be rapidly cooled. The improved air pump employs the circulation of air to the motor so as to lead the external air to the cylinders of the pump so as to keep the motor body and the cylinder at a cooler temperature. This allows the motor to work effectively and efficiently.

CROSS-REFERENCE

This application is related to U.S. Pat. No. 6,716,003, owned by the same applicant.

BACKGROUND OF THE INVENTION

a) Field of the Invention

The present invention relates to an improvement in structure for an air pump, and in particular to an air pump which is sealed to isolate the noise of operation, and of which the motor body and the cylinder can be rapidly cooled.

b) Description of the Prior Art

FIG. 10 shows a closed type mini size air pump A1. The pump A1 includes a motor body A2 and a cylinder body A3. This conventional air pump reduces the noise production from the motor but heat dissipation problem of the motor is occurred. This drawback (heat) may cause the motor being overheated and damaged. Further, the air pump may not function properly to provide sufficient pressurized air. Occasionally the pump has to be stopped in order to provide a proper function. The cylinder top cap A2 is provided with a sealing pad A5.

However, when the piston A31 moves downward, the sealing pad A5 will be opened as a result of suction force. At the same time the pad A5 is sucked to seal and the air can freely enter the air inlet A41. When the piston A31 moves upward, the sealing pad A5 will be repelled as a result of the internal pressure of the piston A31 and the pressured air is discharged to an extension tube A6. In view of this, the piston A31 moves up and down to provide pressure for the air pump.

The conventional motor A1 does not provide heat dissipation in the course of operation. In view of the structure, the motor A2 is linked to the piston A31 with a crankshaft. The reciprocation movement will produce compressed air. Thus, the function of the conventional air pump is restricted by the gear system as well as the shaft. Accordingly, it is an object of the present invention to provide an improved structure for an air pump which will mitigate the drawbacks.

SUMMARY OF THE INVENTION

Accordingly, it is an object of the present invention to provide an improved structure of an air pump having a motor body, a cylinder seat, a silencer cap, a gear system, a cylinder mount, a piston, and a top cap for the cylinder, characterized in that the front sealing cap of the motor body is provided with a plurality of air inlets, and the main shaft of the motor passes through a shaft hole of the cylinder seat, and a locking screw locks the motor body to the cylinder seat, and a driving gear is positioned to the motor main shaft which is engageable with a lower gear, the gear system is positioned at the shaft seal hole mounted at the cylinder seat by means of a center shaft and the other side of the gear is an eccentric interlining shaft positioned to the shaft seal of a piston shaft to provide an up and down reciprocation movement; the cylinder seat is positioned at the circumferential edge of the shaft hole and has a plurality of air inlets, the front of the cylinder seat is sealed with a hollow silencer cap by means of bolt, the top section of the locked region of the cylinder seat and the silencer cap is formed into a circular engaging mount which can enclose the edge section of the cylinder cap and is locked by a locking screw, which can lock the cylinder mount at the same time.

Yet another object of the present invention to provide an improved structure for an air pump, wherein the produced noise is isolated.

A further object of the present invention is to provide an improved structure for an air pump, wherein the motor body and the cylinder can be rapidly cooled, and the device is operating effectively.

The foregoing object and summary provide only a brief introduction to the present invention. To fully appreciate these and other objects of the present invention as well as the invention itself, all of which will become apparent to those skilled in the art, the following detailed description of the invention and the claims should be read in conjunction with the accompanying drawings. Throughout the specification and drawings identical reference numerals refer to identical or similar parts.

Many other advantages and features of the present invention will become manifest to those versed in the art upon making reference to the detailed description and the accompanying sheets of drawings in which a preferred structural embodiment incorporating the principles of the present invention is shown by way of illustrative example.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a preferred embodiment of the present invention.

FIG. 2 is a perspective exploded view of the present invention.

FIG. 3 is a plan view of the cylinder seat of the present invention.

FIG. 4 is a schematic view showing the pump with a belted wheel of the present invention.

FIG. 5 shows a second preferred structure of the eccentric gear;

FIG. 6 illustrates a third preferred structure of the eccentric gear;

FIG. 7 is a sectional view of the air pump in accordance with the present invention.

FIG. 8 is a sectional view of another preferred embodiment of air pump in accordance with the present invention.

FIG. 9 is a sectional view of an air-filtering device of the present invention.

FIG. 9A illustrates a second preferred air-filtering device of the present invention;

FIG. 9B illustrates a third preferred air-filtering device of the present invention;

FIG. 10 is a sectional view of a conventional air filter in accordance with the present invention.

DETAILED DESCRIPTION OF THE PRESENT INVENTION

The following descriptions are of exemplary embodiments only, and are not intended to limit the scope, applicability or configuration of the invention in any way. Rather, the following description provides a convenient illustration for implementing exemplary embodiments of the invention. Various changes to the described embodiments may be made in the function and arrangement of the elements described without departing from the scope of the invention as set forth in the appended claims.

Referring to FIGS. 1 and 2, the air pump of the present invention comprises a motor body 1, a cylinder seat 2, a silencer cap 3, an eccentric gear 4, a piston 5, and a cylinder top cap 6.

The motor body 1 employs a sealing cap 11 to seal off the front and rear openings thereof. The front sealing cap 11 allows the main shaft 12 to be protruded and is provided with a plurality of air inlets 13. After the main shaft 12 passes through a shaft hole 21 on the cylinder seat 2, a locking screw 22 is used to lock the motor body 1 onto the cylinder seat 2. The motor main shaft 12 is engaged with a driving gear 14. The driving gear 14 is engaged with the eccentric gear 4 so that the power is transmitted to the eccentric gear 4 and the RPM ratio is reduced and the operation torque is improved. An end of the motor main shaft 12 extends through the motor body 1 to engage with a fan (shown but not numbered). Further, the motor body 1 is enclosed within a cylindrical casing 10 which is used as a turbulence shield.

The eccentric gear 4 is provided with an eccentric axial member 40 having a center shaft 41 extending outwardly from one side of the eccentric gear 4 and an eccentric linking shaft 42 at an opposite side of the eccentric gear 4. The center shaft 41 is accommodated in a sealed hole in the cylinder seat 2. The eccentric gear 4 is further provided with a weight 401 opposite to the eccentric axial member 40. The eccentric gear 4 eccentrically drives the piston 5 and the center shaft 41 of the eccentric gear 4 is positioned with a hole 24 on the seal 23 engaged on the wall of the cylinder seat 2, acquiring the force from the driving gear 14 to provide rotational function. The eccentric linking shaft 42 is engaged with a seal 51 of the piston 5. By way of eccentrically rotation, the entire piston 5 produces a smooth up-down reciprocating movement.

FIG. 5 shows a second preferred structure of the eccentric gear. As illustrated, a circular eccentric axial member 408 is used to replace the eccentric axial member 40 and the weight 401. FIG. 6 illustrates a third preferred structure of the eccentric gear. As shown, the eccentric axial member 40A is sectorial in shape.

As shown in FIGS. 2 and 7, the front of the cylinder seat 2 is sealed off with a hollow silencing cap 3 and by way of a screw bolt 31, and the cylinder seat 2 is locked together to enclose the piston 5, the driving gear 14, and the eccentric gear 4. In the course of locking the cylinder seat 2 and the silencing cap 3, the top section is formed into circular engaging mounts 25 and 32, which can enclose the edge section 61 of the cylinder top cap 6. The cylinder top cap 6 is formed with a cylinder 62 in which the piston 5 can move reciprocated. The cylinder seat 2 and the silencer cap 3 are provided with fins for heat dissipation.

As shown in FIG. 3, the circumferential edge of the shaft hole 21 of the cylinder seat 2 is also provided with a plurality of air holes 26 which are corresponding to the air inlet 13 of the sealing cap 11. As shown in FIG. 7, when the motor body 1 is in operation, the rotor 15 of the motor rotates rapidly to form air turbulence. Due to rapid up and down movement of the piston 5, suction force is produced and air is drawn through the air slot 16 of the motor body via the cylindrical casing 10. The air goes through air inlets/holes 13 and 26 into the cylinder 5 so that heat dissipation of the motor body 1 and the cylinder mount 5 is obtained. With regards to air inlet and air outlet function of the piston 6, when the piston 5 moves downward, the instantaneous push of the air pressure pushes the sealing pad 53 at the top of the air inlet 52 to lead air into the cylinder 5. When the piston 5 moves upward, the compressed air will push open the sealing pad 64 and close the sealing pad 53 thereby causing the compressed air to be exhausted rapidly.

Referring to FIGS. 8, 9, 9A and 9B, a filtering device 8 is positioned at the air slot 16 motor body 1. The air-filtering device 8 including a top cap 81 is mounted with a cap body 82. The top cap 81 is provided with air hole 811 and the extended circumferential edge is provided with water-stopping edge 812 to prevent water to drip into the air hole 811. The cap body 82 is provided with an insertion section 821 and the interior thereof is provided with filtering aids 83 for air purification and filtering.

FIG. 4 is a schematic view showing the pump with a belted wheel of the present invention, wherein the driving gear 14 and the eccentric gear 4 are replaced with a belted wheel.

It will be understood that each of the elements described above, or two or more together may also find a useful application in other types of methods differing from the type described above.

While certain novel features of this invention have been shown and described and are pointed out in the annexed claim, it is not intended to be limited to the details above, since it will be understood that various omissions, modifications, substitutions and changes in the forms and details of the device illustrated and in its operation can be made by those skilled in the art without departing in any way from the spirit of the present invention. 

1. An air pump comprising: a motor body having a main shaft, said motor body having a front sealing cap that is provided with a plurality of air inlets; a cylinder seat having a plurality of air holes and connected to said motor body such that said plurality of air holes are positioned in corresponding relation to the plurality of air inlets such that air is allowed to flow from the motor body into the cylinder seat, said cylinder seat having a main shaft hole to accommodate the main shaft; a driving gear connected to said main shaft; an eccentric gear operatively engaging the driving gear, said eccentric gear being provided with an eccentric axial member having a center shaft extending outwardly from one side of said eccentric gear and an eccentric linking shaft at an opposite side of said eccentric gear having an eccentric linking shaft, said center shaft being accommodated in a sealed hole in the cylinder seat, said eccentric gear being provided with a weight opposite to said eccentric axial member; a piston having a piston shaft provided with a shaft seal connected to the eccentric linking shaft to allow for reciprocating movement of the piston; a silencer cap having a top section which forms a circular engaging mount with a top section of said cylinder seat; and a cylinder top cap positioned on said cylinder seat and having a cylinder within which said piston is reciprocated.
 2. The air pump as claimed in claim 1, wherein said eccentric gear is integrally formed with said center shaft and said eccentric linking shaft.
 3. The air pump as claimed in claim 1, wherein said motor body is enclosed in a turbulence shield, and a filtering device is mounted to a slot provided on said motor body, said filtering device including a top cover and a cap body, a surface of said top cover being provided with air holes and the circumferential edge being provided with sealing edge, and said cap body being filed with air filtering aids.
 4. An air pump comprising: a motor body having a main shaft, said motor body having a front sealing cap that is provided with a plurality of air inlets; a cylinder seat having a plurality of air holes and connected to said motor body such that said plurality of air holes are positioned in corresponding relation to the plurality of air inlets such that air is allowed to flow from the motor body into the cylinder seat, said cylinder seat having a main shaft hole to accommodate the main shaft; a driving gear connected to said main shaft; an eccentric gear operatively engaging the driving gear, said eccentric gear being provided with an eccentric axial member having a center shaft extending outwardly from one side of said eccentric gear and an eccentric linking shaft at an opposite side of said eccentric gear having an eccentric linking shaft, said center shaft being accommodated in a sealed hole in the cylinder seat, said eccentric axial member being circular in shape; a piston having a piston shaft provided with a shaft seal connected to the eccentric linking shaft to allow for reciprocating movement of the piston; a silencer cap having a top section which forms a circular engaging mount with a top section of said cylinder seat; and a cylinder top cap positioned on said cylinder seat and having a cylinder within which said piston is reciprocated.
 5. An air pump comprising: a motor body having a main shaft, said motor body having a front sealing cap that is provided with a plurality of air inlets; a cylinder seat having a plurality of air holes and connected to said motor body such that said plurality of air holes are positioned in corresponding relation to the plurality of air inlets such that air is allowed to flow from the motor body into the cylinder seat, said cylinder seat having a main shaft hole to accommodate the main shaft; a driving gear connected to said main shaft; an eccentric gear operatively engaging the driving gear, said eccentric gear being provided with an eccentric axial member having a center shaft extending outwardly from one side of said eccentric gear and an eccentric linking shaft at an opposite side of said eccentric gear having an eccentric linking shaft, said center shaft being accommodated in a sealed hole in the cylinder seat, said eccentric axial member being sectorial in shape; a piston having a piston shaft provided with a shaft seal connected to the eccentric linking shaft to allow for reciprocating movement of the piston; a silencer cap having a top section which forms a circular engaging mount with a top section of said cylinder seat; and a cylinder top cap positioned on said cylinder seat and having a cylinder within which said piston is reciprocated. 